Add a regression test for Issue #1511 - 'cvs2svn: trunk can get pruned'.
Add a regression test for Issue #1511 - 'cvs2svn: trunk can get pruned'.

* tools/cvs2svn/run-tests.py
  (no_trunk_prune): New regression test.
  (test_list): Add reference to new test.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion